NC30 30A Fuse Blowing

[jamie125]

Happy New Year All!

The main fuse on my nc30 blows every time its replaced, I haven't had a chance to do some rectifier checks yet, is it likely to be the rectifier itself at fault or a knackered alternator? Or are there other things that could cause this to happen?

Thanks in advance.

[bikemonkey]

Something earthing where it shouldn't and shorting out?

[jamie125]

Argh I hope not, just had a quick look at the rec doesn't looked burnt out & all the cables look ok. May have to start looking for a short.

[jamie125]

Ok, the fuse is fine with all the cabling to the reg/rec removed, does this mean the reg/rec is knackered?

[bikemonkey]

Possibly, could also be the cabling itself catching somewhere.

I'd get out the multimeter

Have fun!

[jamie125]

I'm reading a dead short on the reg/rec across the positive terminal & only 1 of the 3 yellow cable terminals, is this my fault or normal?

[CMSMJ1]

the thing is a pile of diodes - so one way traffic only. The three yellow wires are the genny output - 1 dodgy reading would suggest that the alternator is frazzled..and it took the reg rec with it.

[jamie125]

Yeah the rectifier is knackered, will check alternator aswell. Do the r6 rectifiers fit without modifying the mounting points?